4-16
CHAPTER 4 TESTING
4.7 INCAL MOTOR TESTING (CONT.)
6. Check the potentiometer in the motor by measuring the resistance across pins 3 and 5 it
should be 5K Ohms nominal. Then measure across pins 4 to 3 and rotate the motor shaft
by hand to one stop and then the other stop. The resistance should change uniformly
throughout the range of movement. Measure across pins 4 and 5 and again rotate the motor
shaft in one direction and then the other. The resistance should change uniformly. If there
is a short or open winding, the motor must be replaced. The potentiometer determines the
shaft position by circuitry on the Main PC board.
7. If the motor appears to be good after all tests, examine the lifting mechanism and belt drive.
Note: If the Motor and InCal Mechanism funtion properly during this test procedure, the Main PC
board may be defective.
Figure 4-9. Motor Wiring Diagram.
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